adj.永久的;不断的;无期限的;四季开花的;
例句:
(humorous)She's a perpetual student.
她是个终身学习者。
We lived for years in a perpetual state of fear.
多年来我们一直生活在恐惧中。
The movement is small but perpetual.
这种运动虽然细微却永恒不绝.